$ git clone -n https://src.fedoraproject.org/rpms/picard.git /var/lib/mock/f40-build-2311326-57498/root/chroot_tmpdir/scmroot/picard
Cloning into '/var/lib/mock/f40-build-2311326-57498/root/chroot_tmpdir/scmroot/picard'...
$ git fetch origin 175353922ffabefe314e66ca7999e03e59fac57e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/picard
 * [new ref]         175353922ffabefe314e66ca7999e03e59fac57e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1753539 rhbz#2260332